CN101330332B - Zero intermediate frequency calibration method for board for receiving and sending message - Google Patents
Zero intermediate frequency calibration method for board for receiving and sending message Download PDFInfo
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- CN101330332B CN101330332B CN2007101177719A CN200710117771A CN101330332B CN 101330332 B CN101330332 B CN 101330332B CN 2007101177719 A CN2007101177719 A CN 2007101177719A CN 200710117771 A CN200710117771 A CN 200710117771A CN 101330332 B CN101330332 B CN 101330332B
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Abstract
The invention provides a method for calibrating zero intermediate frequency of a receiving and sending signal board, which comprises the following steps: firstly, setting the initial ideal value of a calibration target adjusting parameter and the ideal target value of a calibration target; secondly, obtaining the actual value of the calibration target after the initial ideal value of the calibration target adjusting parameter is changed according to the length of a first step along the first direction; thirdly, replacing the ideal target value of the calibration target with the actual value of the calibration target and updating the initial ideal value of the calibration target adjusting parameter when the actual value of the calibration target is less than the ideal target value of the calibration target; and fourthly, repeating the step two and step three till the ideal target value of the smallest calibration target is found out in the first direction. The method achieves the automation of the calibration process, thereby saving the human resources and improving the testing efficiency. And at the same time, the operation of the testing process is simple.
Description
Technical field
The present invention relates to the zero intermediate frequency calibration steps of the measuring technology of communication technique field, particularly a kind of board for receiving and sending message.
Background technology
Under the situation that does not reduce base station performance, in order to reduce the volume of base station as much as possible, the core veneer of base station--TRB (Transmit Receive Board, board for receiving and sending message) has adopted ZIF (ZeroIntermediate Frequency, zero intermediate frequency) scheme.
The ZIF scheme is exactly that baseband signal directly is modulated to modulation system a kind of on the radio-frequency carrier.This modulation system does not need intermediate frequency amplification, filtering and frequency conversion part, and has relaxed the performance requirement to the radio frequency part filter, even need not add radio-frequency filter, thereby has greatly reduced volume, weight, power consumption and the cost of transmitter.
Yet the ZIF scheme is to the phase place and the amplitude imbalance of orthogonal demodulation signal and orthogonal local oscillation signal, and the direct current offset distortion is very responsive, therefore can cause serious sideband and local-oscillator leakage.Set quota IQ origin offset (IQ direct current offset) and EVM (Error Vector Magnitude, error vector amplitude) reflect the performance of local-oscillator leakage and sideband respectively among the 3GPP.
Above-mentioned shortcoming can be calibrated by the zero intermediate frequency of board for receiving and sending message and be optimized local-oscillator leakage and sideband, and the zero intermediate frequency of board for receiving and sending message calibration at present mainly is manually to carry out, and specifically comprises the steps:
Tested single board (TRB veneer), many testers and test host computer are put up, formed test environment shown in Figure 1, wherein, these many testers are specially spectrum analyzer, stabilized voltage power supply (not shown) etc.;
Check the indicator light situation on the TRB veneer, check whether connection is normal;
Tester's manual adjustments tester and veneer are measured various results.If the result is suitable, the result is write the memory cell of TRB veneer, otherwise continue to adjust, up to finding the approximate ideal value.
Obviously, there are many shortcomings in above-mentioned test process, and is as described below:
Workload is heavy, need carry out a large amount of settings to TRB and Duo Tai tester, the process more complicated of setting, need simultaneously to data carry out manual record, the manual analysis workload is particularly heavy;
Poor accuracy owing to relate to tester's operation, various mistakes occur unavoidably, and accuracy is difficult to guarantee;
Consistency is poor, and test result depends on tester's technical merit and test experience, and test result is inconsistent, varies with each individual;
The instrument utilance is low, owing to be that instrument manually is set, setting up procedure is slower, causes the utilance of instrument lower.
The difficulty of test height, the judgement of optimal value need the dependence experience be provided with, and the tester not only will understand the use of tester, to understand some basic principles of TRB veneer simultaneously, the functions of each interface etc. have higher requirement, the difficulty of test height to tester's quality.
Summary of the invention
The zero intermediate frequency calibration steps that the purpose of this invention is to provide a kind of board for receiving and sending message, realization are automatically, zero intermediate frequency is calibrated efficiently.
To achieve these goals, the invention provides a kind of zero intermediate frequency calibration steps of board for receiving and sending message, wherein, comprising:
Steps A is provided with calibration target and regulates the initial ideal value of parameter and the target ideal value of calibration target;
Step B after the initial ideal value of first direction with first step-size change calibration target adjusting parameter, obtains the actual value of calibration target;
Step C, the actual value of calibration target replaces with the actual value of calibration target with the target ideal value of calibration target, and upgrades the initial ideal value that calibration target is regulated parameter during less than the target ideal value of calibration target;
Step D, repeating step B and step C are until the target ideal value that finds minimum calibration target at first direction.
Above-mentioned method wherein, also comprises:
Step e during greater than the target ideal value of calibration target, along the opposite direction of first direction, after regulating the initial ideal value of parameter greater than the second step-size change calibration target of first step-length, is obtained the actual value of calibration target in the actual value of calibration target;
Step F, replaces with the actual value of calibration target with the target ideal value of calibration target, and upgrades the initial ideal value that calibration target is regulated parameter during less than the target ideal value of calibration target in the actual value of calibration target;
Step G, repeating step E and step F find the target ideal value of minimum calibration target until the opposite direction at first direction.
Above-mentioned method wherein, also comprises:
Step H when calibration result does not meet the demands, reduces to return step B after first step-length.
Above-mentioned method, wherein, among the described step H, whether first step-length after also judgement reduces is less than default step-length threshold value, if finish calibration, otherwise return step B.
Above-mentioned method, wherein, the difference of the actual value of adjacent twice calibration target finishes calibration during less than predetermined threshold value.
Above-mentioned method, wherein, described calibration target is the IQ direct current offset, it is I road direct current offset and Q road direct current offset that calibration target is regulated parameter.
Above-mentioned method, wherein, described calibration target is the error vector amplitude, it is gain balance and phase equilibrium that calibration target is regulated parameter.
The present invention has following beneficial effect:
Human resources have been saved in the calibration process automation, have improved testing efficiency;
The testing efficiency height, test process simple to operate.
Description of drawings
Fig. 1 is the ZIF test environment structural representation of TRB;
Fig. 2 is the schematic flow sheet of first embodiment of method of the present invention;
Fig. 3 is the schematic flow sheet of second embodiment of method of the present invention.
Embodiment
Zero intermediate frequency calibration steps of the present invention is by after setting up the calibration target ideal value, after the actual value of calibration target and calibration target ideal value are compared, regulates calibration target and regulates parameter, further optimizes calibration target, realizes automatic zero intermediate frequency calibration.
The applied test environment of the inventive method as shown in Figure 1, comprise interconnective host computer, TRB veneer and spectrum analyzer, wherein, this spectrum analyzer has the EDGE option, finishes the initialization setting of TRB veneer and the collection of data by the built-in function of wherein preserving is auxiliary.And the TRB veneer is set to 8PSK modulation mode.
With different embodiment method of the present invention is elaborated below.
＜the first embodiment 〉
In the first embodiment of the present invention, be that example describes with calibration IQ direct current offset.
In actual engineering-environment, the IQ direct current offset is subjected to having the greatest impact jointly of I road direct current offset and Q road direct current offset, and the common influence that is subjected to gain balance and phase equilibrium can be ignored with respect to I road direct current offset and Q road direct current offset, therefore, in the first embodiment of the present invention, calibration target is the IQ direct current offset, and it is I road direct current offset and Q road direct current offset that calibration target is regulated parameter.
As shown in Figure 2, the method for the first embodiment of the present invention comprises:
Whether step 203, the actual value of judging the IQ direct current offset be less than the target ideal value of IQ direct current offset, if enter step 204, otherwise enter step 205;
Whether step 206, the actual value of judging the IQ direct current offset be less than the target ideal value of IQ direct current offset, if enter step 207, otherwise enter step 208;
Certainly, in the above-mentioned handling process, pursuit minimizes for calibration criterion, in the application of reality, can when adjacent 2 calibration target values change less than a preset threshold value, just no longer regulate, promptly in step 204 and 207, add a determining step, if the variation of adjacent 2 times IQ direct current offset during less than predetermined threshold value, is not just further regulated in this direction.
Simultaneously, in above-mentioned handling process, step-length is except changing when changing direction, and other times all no longer change, like this, step-length need be provided with less, reaching more excellent calibration target, but the present invention simultaneously can also be bigger with the initial step length setting, progressively reduces in follow-up adjusting, the number of times of adjusting can be reduced so effectively, also more excellent calibration target can be reached simultaneously.
Promptly repeating step 202～step 209 after reducing first step-length between step 209 and 210 is further regulated the IQ direct current offset, illustrates as follows:
After supposing the initial ideal value of I road direct current offset changed step-length a along first direction, find the target ideal value of the actual value of IQ direct current offset greater than the IQ direct current offset, and after changing step-length 2a in the other direction, the actual value of IQ direct current offset is also greater than the target ideal value of IQ direct current offset, at this moment, just can consider to reduce step-length, readjust.
Simultaneously, consider and unconfinedly to regulate, a step-length corresponding threshold also can be set, during less than this threshold value, promptly no longer further regulate in step-length.
Certainly, before step 210, also a determining step can be set, judge whether the calibration result of IQ direct current offset is desirable, under unfavorable situation, can repeating step 202～step 209 further calibrate.
Simultaneously, consider and unconfinedly to regulate, a calibration target corresponding threshold also can be set, during less than this threshold value, promptly no longer further regulate in the variation of twice of two neighbour's calibration target.
＜the second embodiment 〉
In the second embodiment of the present invention, EVM is that example describes with calibration.
In actual engineering-environment, EVM is subjected to having the greatest impact jointly of gain balance and phase equilibrium, and the common influence that is subjected to I road direct current offset and Q road direct current offset can be ignored with respect to gain balance and phase equilibrium, therefore, in the second embodiment of the present invention, calibration target is EVM, and it is gain balance and phase equilibrium that calibration target is regulated parameter.
As shown in Figure 3, the method for the second embodiment of the present invention comprises:
Step 301 is provided with the initial ideal value of gain balance and phase equilibrium, and obtains the target ideal value of corresponding EVM according to the initial ideal value of this gain balance and phase equilibrium;
Whether step 303, the actual value of judging EVM be less than the target ideal value of EVM, if enter step 304, otherwise enter step 305;
Step 304 replaces with the EVM actual value with the target ideal value of EVM, and upgrades the initial ideal value of the gain balance after changing, and returns step 302;
Step 305 is upgraded the initial ideal value of gain balance, the initial ideal value of gain balance is changed the twice of first step-length along the opposite direction of first direction after, obtain the actual value of EVM;
Whether step 306, the actual value of judging EVM be less than the target ideal value of EVM, if enter step 307, otherwise enter step 308;
Step 307 replaces with the EVM actual value with the target ideal value of EVM, and upgrades the initial ideal value of gain balance, returns step 305;
Step 308 finishes the adjusting of gain balance;
Step 310 with the gain balance that finally obtains and the initial ideal value write storage unit of phase equilibrium, finishes calibration.
Certainly, in the above-mentioned handling process, pursuit minimizes for calibration criterion, in the application of reality, can when adjacent 2 calibration target values change less than a preset threshold value, just no longer regulate, promptly in step 304 and 307, add a determining step, if the variation of adjacent 2 times EVM during less than predetermined threshold value, is not just further regulated in this direction.
Simultaneously, in above-mentioned handling process, step-length is except changing when changing direction, and other times all no longer change, like this, step-length need be provided with less, reaching more excellent calibration target, but the present invention simultaneously can also be bigger with the initial step length setting, progressively reduces in follow-up adjusting, the number of times of adjusting can be reduced so effectively, also more excellent calibration target can be reached simultaneously.
Promptly repeating step 302～step 309 after reducing first step-length between step 309 and 310 is further regulated EVM.
Simultaneously, consider and unconfinedly to regulate, a step-length corresponding threshold also can be set, during less than this threshold value, promptly no longer further regulate in step-length.
Certainly, before step 310, also a determining step can be set, judge whether the calibration result of EVM is desirable, under unfavorable situation, can repeating step 302～step 309 further calibrate.
Simultaneously, consider and unconfinedly to regulate, a calibration target corresponding threshold also can be set, during less than this threshold value, promptly no longer further regulate in the variation of twice of two neighbour's calibration target.
＜the three embodiment 〉
Consider in actual engineering-environment, EVM is subjected to having the greatest impact jointly of gain balance and phase equilibrium, and the common influence that is subjected to I road direct current offset and Q road direct current offset can be ignored with respect to gain balance and phase equilibrium, the IQ direct current offset is subjected to having the greatest impact jointly of I road direct current offset and Q road direct current offset, and the common influence that is subjected to gain balance and phase equilibrium can be ignored with respect to I road direct current offset and Q road direct current offset, therefore, EVM and IQ direct current offset are independently substantially, adjusting to the two is not disturbed basically mutually, therefore, in the third embodiment of the present invention, regulate IQ direct current offset and EVM simultaneously.
The method of the third embodiment of the present invention comprises:
Step 401, the initial ideal value of I road direct current offset, Q road direct current offset, gain balance and phase equilibrium is set, and obtains corresponding IQ direct current offset and the target ideal value of EVM according to this I road direct current offset, Q road direct current offset, gain balance and phase equilibrium;
Step 402, the initial ideal value of I road direct current offset and gain balance changed first step-length and second step-length along first direction respectively after, upgrade the initial ideal value of I road direct current offset and gain balance, and obtain the actual value of IQ direct current offset and EVM;
Step 403, the relation of the actual value of judgement IQ direct current offset and EVM and the target ideal value of IQ direct current offset and EVM;
At this moment, there is following situation, is described respectively below.
1, the actual value of IQ direct current offset and EVM is all less than the target ideal value of IQ direct current offset and EVM
In this case, returning step 402 continuation adjusting gets final product.
2, the actual value of IQ direct current offset and EVM is all greater than the target ideal value of IQ direct current offset and EVM
Step 404, after the initial ideal value of I road direct current offset and gain balance changed the twice of first step-length and second step-length respectively along the opposite direction of first direction, upgrade the initial ideal value of I road direct current offset and gain balance, obtain the actual value of IQ direct current offset and EVM;
3, one of them actual value of IQ direct current offset and EVM is less than the target ideal value, and another greater than actual value greater than the target ideal value (for convenience of description, less than the target ideal value, and the actual value of EVM is greater than the target ideal value in actual value of this hypothesis IQ direct current offset)
At this moment, separately regulate, that is:
For I road direct current offset, return step 402 and regulate, for gain balance, enter step 404 and regulate, that is:
After the initial ideal value of I road direct current offset changed first step-length along first direction respectively, upgrade the initial ideal value of I road direct current offset, and obtain the IQ direct current offset;
After the initial ideal value of gain balance changed the twice of second step-length along the opposite direction of first direction, upgrade the initial ideal value of gain balance, obtain the actual value of EVM.
Under the 3rd kind of situation, follow-up processing has separated, and follow-up flow process is corresponding with first embodiment and second embodiment respectively, does not repeat them here.
And for the 2nd kind of situation, after step 404 is adjusted, above-mentioned situation can appear also, be described below respectively:
The actual value of IQ direct current offset and EVM is returned step 404 continuation adjusting and is got final product all less than the target ideal value of IQ direct current offset and EVM;
The actual value of IQ direct current offset and EVM all greater than the target ideal value of IQ direct current offset and EVM, then finishes the adjusting of I road direct current offset and gain balance;
One of them actual value of IQ direct current offset and EVM is less than the target ideal value, and another greater than actual value greater than the target ideal value (for convenience of description, in actual value of this hypothesis IQ direct current offset less than the target ideal value, and the actual value of EVM is greater than the target ideal value), I road direct current offset 404 continuation is set by step regulated, and gain balance finishes to regulate.
Carry out above-mentioned processing, in the time of till I road direct current offset and gain balance all can't further be optimized IQ direct current offset and EVM, with I road direct current offset with gain balance replaces with Q road direct current offset and phase equilibrium is further adjusted, its handling process is compared without any difference with gain balance with I road direct current offset, does not repeat them here.
With the initial ideal value write storage unit of the I road direct current offset, Q road direct current offset, gain balance and the phase equilibrium that obtain, finish calibration at last.
Certainly, in the above-mentioned handling process, pursuit minimizes for calibration criterion, in the application of reality, can just no longer regulate when adjacent 2 calibration target values change less than a preset threshold value.
Simultaneously, in above-mentioned handling process, step-length is except changing when changing direction, and other times all no longer change, like this, step-length need be provided with less, reaching more excellent calibration target, but the present invention simultaneously can also be bigger with the initial step length setting, progressively reduces in follow-up adjusting, the number of times of adjusting can be reduced so effectively, also more excellent calibration target can be reached simultaneously.
Simultaneously, consider and unconfinedly to regulate, a step-length corresponding threshold also can be set, during less than this threshold value, promptly no longer further regulate in step-length.
Certainly, also a determining step can be set, judge that whether calibration result is desirable, under unfavorable situation, can repeat further calibration.
Simultaneously, consider and unconfinedly to regulate, a calibration target corresponding threshold also can be set, during less than this threshold value, promptly no longer further regulate in the variation of twice of two neighbour's calibration target.
At 3 above-mentioned embodiment, changing step-length for the first time, the actual value of the IQ direct current offset/EVM that obtains is less than after the target ideal value, and just the target ideal value with IQ direct current offset/EVM of obtaining replaces with actual value.
But consider the error that measuring instrument exists, therefore in follow-up determining step, the target ideal value of the IQ direct current offset/EVM that only obtains and the difference of actual value are just replaced during greater than an error threshold, otherwise will not replace.
The size of this error threshold is relevant with factors such as step-length, testers.
Describe with a concrete instance below.
The target ideal value of supposing present calibration target is 10, and the actual value of supposing calibration target is 9, and error component (error threshold) is 2, consider measure error this moment, this moment, real actual value was 11, and introduce fuzzy value this moment, eliminates the influence that measure error is brought with this.
Among 3 above-mentioned embodiment, also other step can be set, during less than a default optimal threshold, directly finish calibration in the actual value of certain calibration target that once records.Certainly, this default optimal threshold is better than the initial value in the step 201,301 and 401.
This is described as follows for example.
When supposing only to calibrate the IQ direct current offset, when having calibrated I road direct current offset, find that IQ direct current offset actual value just makes calibration result better than default optimal threshold, then do not need to calibrate Q road direct current offset, finish calibration immediately.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1. the zero intermediate frequency calibration steps of a board for receiving and sending message is characterized in that, comprising:
Steps A is provided with calibration target and regulates the initial ideal value of parameter and the target ideal value of calibration target;
Step B after the initial ideal value of first direction with first step-size change calibration target adjusting parameter, obtains the actual value of calibration target;
Step C, the actual value of calibration target replaces with the actual value of calibration target with the target ideal value of calibration target, and upgrades the initial ideal value that calibration target is regulated parameter during less than the target ideal value of calibration target;
Step D, repeating step B and step C are until the target ideal value that finds minimum calibration target at first direction.
2. method according to claim 1 is characterized in that, also comprises after described step D:
Step e during greater than the target ideal value of calibration target, along the opposite direction of first direction, after regulating the initial ideal value of parameter greater than the second step-size change calibration target of first step-length, is obtained the actual value of calibration target in the actual value of calibration target;
Step F, replaces with the actual value of calibration target with the target ideal value of calibration target, and upgrades the initial ideal value that calibration target is regulated parameter during less than the target ideal value of calibration target in the actual value of calibration target;
Step G, repeating step E and step F find the target ideal value of minimum calibration target until the opposite direction at first direction.
3. method according to claim 2 is characterized in that, also comprises between described step C and the D:
Step I, whether the target ideal value of judging calibration target is less than default optimal threshold, if then finish calibration, otherwise enter step D;
Described step D is specially:
Repeating step B, step C and step I are until the target ideal value that finds minimum calibration target at first direction.
4. method according to claim 2 is characterized in that, also comprises between described step F and the G:
Step J, whether the target ideal value of judging calibration target is less than default optimal threshold, if then finish calibration, otherwise enter step G;
Described step G is specially:
Repeating step E, step F and step J find the target ideal value of minimum calibration target until the opposite direction at first direction.
5. method according to claim 2 is characterized in that, also comprises after the step G:
Step H when calibration result does not meet the demands, reduces to return step B after first step-length.
6. method according to claim 5 is characterized in that, among the described step H, whether first step-length after also judgement reduces is less than default step-length threshold value, if finish calibration, otherwise return step B.
7. according to any described method of claim of claim 1 to 4, it is characterized in that described calibration target is the IQ direct current offset, it is I road direct current offset and Q road direct current offset that calibration target is regulated parameter.
8. according to any described method of claim of claim 1 to 4, it is characterized in that described calibration target is the error vector amplitude, it is gain balance and phase equilibrium that calibration target is regulated parameter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102469055B (en) * | 2010-11-17 | 2016-02-17 | 联芯科技有限公司 | The DC offset calibration method of zero intermediate frequency reciver and device |
| CN110865235A (en) * | 2019-11-29 | 2020-03-06 | 山东浪潮人工智能研究院有限公司 | Automatic calibration system and method for frequency mixer |
| CN112051447B (en) * | 2020-07-24 | 2024-02-13 | 山东浪潮科学研究院有限公司 | Method, equipment and medium for calibrating direct current bias of mixer |
| CN112083370B (en) * | 2020-08-25 | 2024-02-09 | 山东浪潮科学研究院有限公司 | Method, equipment and medium for calibrating direct current bias of mixer |
| CN113411088B (en) * | 2021-06-17 | 2022-11-11 | 北京奕斯伟计算技术股份有限公司 | I/Q imbalance calibration method and device for zero intermediate frequency wireless transmitter |
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| CN1554154A (en) * | 2000-10-02 | 2004-12-08 | 英特赛尔美国公司 | A calibrated DC compensation system for a wireless communication device configured in a zero intermediate frequency architecture |
| CN1707961A (en) * | 2004-06-09 | 2005-12-14 | 鼎芯通讯（上海）有限公司 | Zero intermediate frequency radio receiver second-order inter-modulation automatic correcting circuit |
| CN1719736A (en) * | 2005-07-19 | 2006-01-11 | 中兴通讯股份有限公司 | Method for correcting power |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1554154A (en) * | 2000-10-02 | 2004-12-08 | 英特赛尔美国公司 | A calibrated DC compensation system for a wireless communication device configured in a zero intermediate frequency architecture |
| CN1707961A (en) * | 2004-06-09 | 2005-12-14 | 鼎芯通讯（上海）有限公司 | Zero intermediate frequency radio receiver second-order inter-modulation automatic correcting circuit |
| CN1719736A (en) * | 2005-07-19 | 2006-01-11 | 中兴通讯股份有限公司 | Method for correcting power |
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